I saw these lines in a demo project, but I couldn't understand why it did that.

[self willChangeValueForKey:@"names"];
[self didChangeValueForKey:@"names"];

It called didChangeValueForKey immediately after willChangeeValueForKey. Does it make any sense?

Furthermore, when should be the right time to call this two methods? Thanks a lot!! :)

objective-c macos
Edit
Report